The way Python calls js

Zero, sample demo.js

// demo.js
function get_m(a, b){
    
    
    m = a+b
    return m
}

module.exports = {
    
    
    get_m
}

1. execjs

• Dependency: execjs will automatically use the runtime environment on the current computer (nodejs is recommended)
• Install:pip install PyExecJS
• Guide package:import execjs
• Calling method 1: execjs.compile( js代码).call( 函数名, 参数1, 参数2) , this method is recommended to save the js code in the file

  import execjs
  
  with open(r"./demo.js", encoding="utf-8") as f:
      ctx = execjs.compile(f.read())
      print(ctx.call('get_m', 5, 6))  # 11
  

• Calling method 2: execjs.eval( js代码)

  import execjs
  
  print(execjs.eval("cookie='Hm_lvt_444ece9ccd5b847838a56c93a0975a8b=1636208098'"))
  

Two, MiniRacer

• Install:pip install py_mini_racer
• Guide package:from py_mini_racer import MiniRacer
• The calling method is as follows

  from py_mini_racer import MiniRacer
  
  with open(r"./demo.js", encoding="utf-8") as f:
      ctx = MiniRacer()
      ctx.eval(f.read())
      print(ctx.call('get_m', 5, 6))
  

3. NodeVM

• Install:pip install node_vm2
• Guide package:from node_vm2 import NodeVM
• Call method 1 is as follows: call js file

  from node_vm2 import NodeVM
  
  with open(r"./demo.js", encoding="utf-8") as f:
      ctx = NodeVM.code(f.read())
      print(ctx.call_member("get_m", 5, 6))
  

• The calling method 2 is as follows: use eval

  from node_vm2 import eval
  
  print(eval("cookie='Hm_lvt_444ece9ccd5b847838a56c93a0975a8b=1636208098'"))
  

• Changed the computer environment and suddenly reported an error: TypeError: write() argument must be str, not bytes, the first step is to remove line 488.encode("utf-8")
  
  
• Then run and then report an error 'str' object has no attribute 'decode', then remove the line 395 as follows .decode("utf-8"), and then it will be normal
  
  

Four, nodejs service call

• end of this article